Patents by Inventor Pierre R. Sonneville

Pierre R. Sonneville has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Optical disk tracking and seeking systems and specific track formats using servo areas
    Patent number: 4914645
    Abstract: An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medium. The high frequency content of a first signal is combined with the low frequency content of a second signal, which is generated using the wobbled areas. In another embodiment, light-reflective discontinuities are provided in the header areas of the record medium. A qualifier and an AGC are utilized in providing a corrected track following signal. In still another embodiment, reflective discontinuities are located in the servo areas of the record medium. In such an embodiment, it is preferred that there is a fixed gain adjustment to a radial push-pull signal.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: April 3, 1990
    Assignee: Laser Magnetic Storage International Company
    Inventors: Kurt W. Getreuer, Johannes J. Verboom, David L. Schell, David E. Lewis, Gregory V. Hofer, Kathleen M. Connelly, James C. McDonald, Pierre R. Sonneville, Cees van Nimwegen
  • Optical disk tracking and seeking systems specific track formats using discontinuities
    Patent number: 4879707
    Abstract: An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medium. The high frequency content of a first signal is combined with the low frequency content of a second signal, which is generated using the wobbled areas. In another embodiment, light-reflective discontinuities are provided in the header areas of the record medium. A qualifier and an AGC are utilized in providing a corrected track following signal. In still another embodiment, reflective discontinuities are located in the servo areas of the record medium. In such an embodiment, it is preferred that there be a fixed gain adjustment to a radial push-pull signal.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: November 7, 1989
    Assignee: Laser Magnetic Storage International Company
    Inventors: Kurt W. Getreuer, Johannes J. Verboom, Pierre R. Sonneville